What is added after is?

Is is a copula, followed by nouns, adjectives, numerals or prepositions or phrases composed of these words, which is the predicative part of a sentence. She is a doctor. She is a doctor. Very good. That's good.

Usage of is and are

1.are can be used in the first person, the second person and the third person; Is is only used in the third person.

2.are can be used in singular and plural; Is is in singular form only.

The specific usage of the two is:

Are is used after the second person singular (you) and all plural (we, you, them); Is is used after the third person singular (he, she, it).

The past tense of are is was and the past tense of is is was.

Don't cry, you are a big boy now.